Machine for sharpening pencils



(No Model.)

C. A.- NEUBRT.

MACHINE FOR SHARPENING PBHNQILS. NO. 303,314. Patented Aug;4 12, 1884. y

jlllllll III fwn wmp NITED STATES ATENT OFFICE.

CHARLES A. NEUERT, OF BOSTON, MASSACHUSETTS.

MACHINE FOR SHARPENING PENCTILS.l

SPECIFICATION formingvpart of LettersPatei-it No. 303,314-, dated August12, 1884.

Application filed June 23, 1884/1.- (No model.)

To all 'whom t may concern.-

Bc it known that I, CniinLns A. NnUnR'r,

, of Boston, county of Suffolk, State of Massagrinding-wheel.

. My inventiu consists, primarily, in a rotating pencil holding andfeeding chuck, combined with a grinding-wheel, theV surface of whiehisdivided into sections which are adapted to reduce or cut away thematerial of the pencil at different rates of speed, the section 4of thegreatestreducing power being arranged nearest to the chuck, while thesection having the least power of reduction islocated farthest from thechuck.

My invention further consists in a pencil grinding or reducing wheel anda chuck or pencil-holder having a screw-threadon its eX- terior,combined with an interiorlythreadedstationary support or bearing for thethreaded part of the chuck, and with mechanism for rotating the chuck,as will be hereinafter described.

Figure 1 is a front elevation of apencilsharpening machine embodying myinvention; Fig. 2, a side elevation there'o'looking iu the direction ofthe arrow, Fig. l; and Fig. 3 a sectional detail of the chuck orpencil-holder.

The frame A, which may be of any suitable construction to support theoperating parts, is preferably provided with the lips c af, andthumb-screw 5, passing through the lower lip,

c', to permit the frame to be clamped or held to a bench, table, orother'support.

The driving-wheel B, having the handle or crank b to enable it to berotated, is secured on the stud c, attached to the lower part of theframe, and meshes with the long intermediate gear d, firmlyv secured tothe shaft D, supported in the bearing 2 of the frame A, and receivingthe grinding-wheel E at its other end, -said wheel being held thereon bymeans of the thumb-nut 3 engaging the screwthreaded end of the shaft l).The grindingwheel is made up of two or more sections or disks, e e el-inthe present instance three which are each of different reducing power tothe other-that is to say, the periphery of the disk, c, nearest thepencil-holder, (to be presently described,) is rough or provided with acoarse and sharp cutting material, such as sand or coarse emery, whilethe face of the next disk c is provided with a medium grade of sand oremery., and the face of the last disk, c2, has the finest cuttingiorreducing material Vof the three, so that the first disk has the.

greatest reducing action to rapidly cut away or reduce the wood of thepencil as the latter is fed to the grindingwheel,while, as the peucilbecomes in a measure roughly pointed,the last disk, e2, or that onefarthest removed from the pencil-holder and which has the least power ofreduction, acts upon the thin or tapered end of the pencil to properlypoint the Asame without breaking the thin or reduced end. By thisconstruction, the grindingwheel has variable or different powers ofreduction across its face. The grinding-wheel will preferably be made upof disks of wood arranged on a metal hub, 6, and having their facescoated with different grades of sand or emery, and secured together withscrews, as shown in Fig. 2.

rThe pencil-holding chuck is composed of an inner split j aw-likesleeve, a, extended through another sleeve, F, provided externally witha fine screw-thread, 8, the inner split part, a, -of the chuck beingprovided with inclines 10 and with a threaded portion, 12, to receive anut, 13, which, abutting against the rear end of the sleeve F, may beturned to cause the IOO pencihp, in the chuck, is as in full lines,Fig. 1. The sleeve F has fastened to it the toothed gear f, whichengages the long intermediate gear, d, and as the latter is rotated bythe toothed wheel B, the sleeve F and chuck are rotated, and at suchtime because of the fine threads 8 the chuck is moved forward slowlywith the pencil, presenting the same to the grinding-wheel, which cutsaway the material of the pencil and forms a conical point for it, asrepresented by the dotted lines. While the chuck is so moved forward,the wheel f is made to travel longitudinally in engagement with the longgear d. The face of the grindingwheel is beveled toward the chuck, asshown, to reduce or sharpen the pencil at the proper angle.

It is obvious, instead of the grinding-wheel made up of sections, that Imay use a wheel the grinding-surface of which is uniform.

1. The combination, with a rotating pencilholder or chuck, of agrinding-wheel the face of which is divided into sections the surfacesof which are adapted to reduce or cnt away the material of the pencil atdifferent rates of speed, the section of the greatest reducing powerbeing arranged nearest to the chuck, while the section having theleastpower of reduction is farthest removed from the chuck,substantially as set forth.

2. The grinding-wheel and rotating pencilholder or chuck, provided onits periphery with a fine screw-thread combined witha stationary bearinghaving at its interior a screwthread to be engaged by the thread on thechuck, whereby the pencil is carried forward automatically as its pointis being sharpened, substantially as set forth.

3. vThe rotating grinding -wheel, the long gear on its shaft, theexternal-threaded chuck or pencil-holder, and toothed gear f, securedthereto, and engaging the long gear d, combined with a threaded hub,f2,and with means, substantially as described, for rotating the long gearand grinding-wheel, to operate as set forth.

In testimony whereof I have signed my naine to this specification in thepresence of two subscribing witnesses.

CHARLES A. NEUE-RT.

. Vitnesses:

G. XV. GREGORY, B. J. NoYns.

